43423044421 has 4 divisors (see below), whose sum is σ = 43456733100. Its totient is φ = 43389355744.

The previous prime is 43423044403. The next prime is 43423044443. The reversal of 43423044421 is 12444032434.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23553040900 + 19870003521 = 153470^2 + 140961^2 .

It is a cyclic number.

It is not a de Polignac number, because 43423044421 - 2⁵ = 43423044389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43423041421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16842406 + ... + 16844983.

It is an arithmetic number, because the mean of its divisors is an integer number (10864183275).

Almost surely, 2^43423044421 is an apocalyptic number.

It is an amenable number.

43423044421 is a deficient number, since it is larger than the sum of its proper divisors (33688679).

43423044421 is a wasteful number, since it uses less digits than its factorization.

43423044421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33688678.

The product of its (nonzero) digits is 36864, while the sum is 31.

Adding to 43423044421 its reverse (12444032434), we get a palindrome (55867076855).

The spelling of 43423044421 in words is "forty-three billion, four hundred twenty-three million, forty-four thousand, four hundred twenty-one".